Vitamin A and hair
Vitamin A is essential for maintaining healthy eyes, bones, glands, hair and skin. In conjunction with silica and zinc, it helps prevent drying and clogging of sebaceous glands.
Deficiency can lead to dandruff and dry dull hair. It causes the scalp to thicken, trapping oil and perspiration beneath the surface.
Sufficient amount of viatmin A is required for the thyroid gland to take in enough iodine. And as you all know iodine is also essential for healthy hair.